Fix issue with arrow potentially not loading #8
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This PR should resolve #7. The basic approach here is to use the same "fractional pixels" idea that we used in the solar eclipse story. This allows us to draw the arrow without needing to secretly zoom in first. Also, rather than setting a timeout and hoping that WWT is ready, we now create the arrow via a timeout function that will repeat as many times as necessary - basically, it will either draw the arrow, or re-queue itself to run in 100ms if we hit an error.